Thread rolling machine for pipes



lo, L' F. PARKER ET AL THREAD ROLLING MACHINE FOR PIPES Filed Sepb. 28, 1948 3 Sheets-Sheet l prl 10, 195i L.. F. PARKER ET AL 2,548,444

THREAD ROLLING MACHINE FOR PIPES .pl10,1951 L.F.PARKER ETAL THREAD ROLLING MACHINE FOR PIPEs 5 Sheets-Sheet 5 Filed Sept. 28, 1948 um smwlnn u Nu iwnmNINurlnw Patented Apr. 10, 1951 THREAD ROLLING MACHIN FOR PIPES Laurie F. Parker, deceased, late of Minden, La., f*

by Myrtle M. Webb, executrix, Shreveport, and l Arthur J. Sharp, Minden, La., assignors to J. Roy Parker and John B. Parker, both of Shreveport, La.

Application-September 28, 1948, Serial No. 51,582

1 The object of the present invention is to provide a simple and inexpensive thread rolling machine adapted for metallic pipes and cylinders and 4by means of which the necessary lateral pressure on the pipe wall of the threading rolls may be-effected by a manuallyoperated cylindrical cam, the threading roll thus .beingr inter-geared and mounted .for pivotal movement in addition to their rotational movements.

The invention will be described with reference to the accompanying drawing, in which` Fig. l is a view in elevation illustratingan embodiment of the invention, certain elementsbeing broken away, and a pipe being shown in position for a continued threading operation. l

Fig. 2 is 'a view similar to Fig. l showing the position of the elements with the upper thread-v ing roll partly raised preceding withdrawal of the pipe, the latter being shown in dotted lines.

Fig. 3 is a fragfr'ientary 'vertical rsection on the line 3-3, Fig. 2.

Fig. 4 is a vertical section taken generally at the line 4 4, Fig. 5.

Fig. 5 is a vertical section taken at the line 5 5, Fig. 4.

Fig. 6 is a detail view partly broken away showing a threading Vroll and its mounting.

Fig. I'Iris an end View of the structure shown in Fi'g. 6. A

Fig. 8 is a -schematic section through a pipe area h'aVi'ngthread-s producedther'ein and showing opposed roll sections abutting the pipe wall.

Fig. 9 i's a schematic view showing an expanded male pipe end and a female pipe end threaded therein.

Referring to the drawings we have indicated at 5 Claims. (Cl. 153-71) I a horizontal frame from which rises a seat member 2. On the seat member is bolted a bracket 3 which is slotted to provide a guideway 3:1: for a slide-block 4. Through the slide-block extends a stud 5 connecting the block with a cam ring 6. It will be understood that at the opposite side of the cam ring a duplication of the aforesaid bracket, slide-block and stud arrangements will be provided for balance support of the cam ring.

The studs 5 on alternate sides of the cam ring 6 are connected to links "I, one of the links being shown in Fig. 1, and each link is pivoted at 8 to the yoke arm of a yoke lever 9 which is pivoted to a member of the frame I, one of the pivotal points which is indicated at Fig. l at I0.

Yoke 9 is connected at the top to a toggle consisting of the two links II and Ilm, the latter being pivoted at I2 on a fixed bracket I3 and link Il being pivoted at I4 to the yoke lever.

A toggle operating lever is provided. To this end the pivotal connection Ilma: between the toggle links carries a roller which enters the elongated slot of toggle operating lever I5. By such Y 2 means the cam ring maybe given positive'forward and backward movements with adequate force, and the closing of the toggle in forward movement of the cam ring will hold theplatter in such adjusted position. f

Supported on` the base I is an electric motor I6 the spindle of which will be connected to Aa driving head, the latter being indicated at I'l, Fig; li. Bolted to the driving head Il is a threadcal channel way in the position of the parts shown in Figs. 4 and 5 through the use of forwardly projecting webs l8r, and laterally of webs l8r are reinforcing ribs I9. Pivoted in the channel way provided by ribs IS is a forwardly projecting bar 25 which is formed with a shaft 20a: at its forward end.` This shaft extension 29a: .has rotationally mounted thereon a unitary assembly consisting of a tapered friction wheel 2l, a gear 22,' and a spirally ribbed threading roll 23. 1A pivot pin 24 permits swingingmovement of bar 20 and the members'carried thereby.

The channel way carries a central assembly similar to that described. It consists of a bar 25 pivoted atZB, the bar carrying shaft-like extension 2l on which is mounted integral assembly of gear 28 and spirally ribbed threading .roller 29. Bolted cap plates 39 are employed at the ends of shafts 2M: and 21 in each case to hold the assembly of gear 'and threading roll on the appropriate shaft. f

, Within the channel way provided by `ribs .Ix isa third bar -31 lpivotedat 32 rand carrying a short shaft extension 33 on which is mounted a tapered friction wheel 34 which friction wheel is held for rotation on' the shaft by cap-plate 35.

When cam ring 4 is moved to the right from its position in Fig. 4 it will move the tapered friction wheels and the members carried thereby inwardly. Bar 3l is provided with an abutment to contact with bar 25 and force the same toward bar 20 which carries spirally ribbed threading roll 23. In the drawings this abutment is shown as a headed stud 36 which is threaded in bar 3I. Normally, and when the cam ring is retracted, a spring 31 acts to separate the threading rollers 23 and 29 sufficiently to enable insertion of the pipe for the threading operation. Such a pipe is indicated at P in the drawings.

As shown in Fig. 1, and also in Fig. 2, a pivoted stop member may be employed for abutment by the toggle operating lever I5 and/or yoke lever 9 when the cam ring is moved to threading position of the elements. Such a stop member is shown at 31x, it being pivoted at 38 on a bracket arm 39 secured to a fixed member of the machineV frame.

The rolling action on a pipe is performed by a progressive upsetting and deformation of the pipe wall similar to a drawing action and it will be understood that the female end of a pipe into which a second pipeis to be threaded, will be suitably expanded to permit such action. For

receiving the threads at one end a pipe may be"v placed upon the forward area of the roll 39', while said pipe is supported, which support can be given manually or provided by any suitable support so as to be slidable by or With the sup- :icarrier having a shaft-like end on which is rotaf tionally mounted an assembly consisting of a port or independently of the support. In other' Words the pipe is given axial movement relatively to the threading rollers.

It will be understood that various modifications may be made in the form and arrangement of the elements constituting the embodiment of .the invention illustrated in the drawings, Without departing from the spirit of the invention.

Having described our invention what we claim as new and desire to secure by Letters Patent, is as follows:

l. A thread rolling machine comprising a pair of spirally ribbed threading rollers, a pair of members upon which said rollers are mounted for rotation, a support, means pivotally mounting said members to said support, driving means for bodily rotating said support and thereby the rollers, means for moving said threading rollers toward each other for operative compressive movement upon the wall of a pipe, and means for holding the threaded rollers in onset relationship with respect to the axis of rotation of the support.

2. A'thread rolling machine for a, pipe comprising a pair of spirally ribbed threading rollers, a pivoted carrier upon which each threading roller is rotatable, gears interconnecting the threading rollers, a third pvoted carrier, tapered bearing rollers carried by one of the threading rollers and by the third pivoted carrier and positioned for mutual engagement, a rotatable support common to all of said pvoted carriers, means for rotating said support, a cam ring engaging said tapered bearing rollers, means for bodily moving said cam ring, and means on the third carrier for maintaining the other carriers and their rollers in a proper predetermined relative position with respect to each other.

3. A thread rolling machine for pipe consisting of a rotatable support'and means'or rotating spirally ribbed threading roller, a, gear meshing with the first named gear and a tapered friction roller, the third carrier having a shaft-like end rotationally supporting a tapered friction roller, a cam ring encircling said tapered rollers and manually operable means for shifting said cam ring, and means on thev second outer carrier for maintaining the central carrier in proper position between the outer carriers.

4. A thread rolling machine for pipe constructed in accordance with claim 3 in combina- .tion with an adjustable abutment intermediate the second outer carrier and the central carrier and means for yieldingly exerting separating pressure between the irst outer carrier and the central carrier.

5. A' thread rolling machine for pipe constructed in accordance with claim 3 in combination with a support for the cam ring consisting of slide blocks a lever and link connection for at least one of said slide blocks, a toggle connected to the said lever, and a slotted manually operable lever arm receiving in its slot a stud at the connection of the toggle links, as and for the purpose described.

MYRTLE M. WEBB. Eecutrzx of the Last Will and Testament of Laurie F. Parker, Deceased.

" ARTHUR J. SHARP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 64,495 Cone et al. May 7, 1867 369,417 Voigt Sept. 6, 1887 j. 859,644 Cummings July 9, '?V 2,445,303 Fisher July 13, 1948 

